My Inquiry
My Account
NXP Semiconductors UJA1078TW/3V3/WD,1
- Part No.:
- UJA1078TW/3V3/WD,1
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Datasheet:
-
UJA1078TW/3V3/WD,1.pdf
- Description:
- IC INTFACE SPECIALIZED 32HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,139
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UJA1078TW/3V3/WD,1 from NXP Semiconductors is a core System Basis Chip (SBC) integrating a high-speed CAN transceiver (ISO 11898-2/5 compliant), two LIN 2.1 transceivers (SAE J2602 compliant), a 3.3 V/250 mA microcontroller voltage regulator, a dedicated 5 V CAN transceiver regulator, and an advanced window/timeout watchdog - all in a single HTSSOP32 package for automotive ECU power and communication management.
For engineers reviewing the UJA1078TW/3V3/WD,1 datasheet, UJA1078TW/3V3/WD,1 pinout, UJA1078TW/3V3/WD,1 application, or UJA1078TW/3V3/WD,1 equivalent, this SBC delivers deterministic system startup, bus wake-up detection (CAN/LIN/local), limp-home safety output, SPI-based diagnostics, and ISO 7637-3 transient-protected I/O for engine control, body electronics, and ADAS domain controllers requiring robust automotive-grade integration.
Technical Context
The UJA1078TW/3V3/WD,1 implements a state-machine-based system controller managing Off/Standby/Normal/Sleep/Overtemp modes with programmable transitions via SPI registers (e.g., Mode_Control MC bits). Its dual-regulator architecture isolates V1 (3.3 V for MCU/peripherals) from V2 (5 V for CAN transceiver), enabling independent undervoltage monitoring (90 %/70 % reset thresholds) and thermal-aware PNP extension support (Ith(act) = 50–85 mA).
It features full-duplex SPI (16-bit, falling-edge sample/rising-edge shift) for register access, including WD_and_Status (NWP programmable 8–4096 ms watchdog period), Int_Control (peripheral wake-enable granularity), and Int_Status (bit-clearable interrupt flags). All transceivers support low-slope LIN operation and floating bus pins in Off mode, with ±58 V short-circuit protection on CAN/LIN lines and ±8 kV HBM ESD rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CAN Interface | ISO 11898-2/5 compliant high-speed transceiver; enables main ECU network backbone with bus wake-up and SPLIT pin for recessive level stabilization |
| LIN Interfaces | Dual LIN 2.1 transceivers compliant with SAE J2602 and backward-compatible with LIN 2.0/1.3; support low-slope mode for EMC optimization |
| V1 Regulator | 3.3 V ±2 % (LIN master) / ±3 % (LIN slave) output; delivers up to 250 mA; supports external PNP extension with selectable activation threshold (50/85 mA) |
| V2 Regulator | 5 V dedicated supply for integrated CAN transceiver; undervoltage warning at 90 % nominal; switchable off to reduce quiescent current |
| Watchdog | Window and Timeout modes with on-chip oscillator clock source; programmable period (8–4096 ms); WDOFF pin disables watchdog and triggers software reset |
| SPI Interface | Full-duplex 16-bit interface with SCSN/SCK/SDI/SDO; supports read-only register access and status feedback during write operations |
| Package | HTSSOP32 (SOT549-1); 6.1 mm × 11 mm body; 0.65 mm pitch; exposed die pad for PCB heat dissipation; RoHS and dark green compliant |
Pinout & Package
HTSSOP32 package (SOT549-1) with 32 leads, 6.1 mm body width, 0.65 mm lead pitch, and exposed die pad thermally connected to PCB ground or left floating per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1 (Pin 4) | Main MCU supply output | 3.3 V regulated output; powers microcontroller and peripherals; supports external PNP extension via VEXCTRL/VEXCC |
| V2 (Pin 20) | CAN transceiver supply | 5 V dedicated regulator output; electrically isolated from V1; can be disabled to reduce standby current |
| RSTN (Pin 6) | Bidirectional reset I/O | Drives LOW during power-on, overtemperature, or watchdog overflow; accepts variable-length reset pulse from MCU |
| INTN (Pin 7) | Interrupt output | Open-drain signal indicating V1/V2 undervoltage, CAN/LIN wake-up, cyclic event, or power-on condition |
| WAKE1/WAKE2 (Pins 18/19) | Local wake-up inputs | Configurable edge-sensitive inputs; sampling synchronized to WBIAS (16/64 ms) when enabled; support low-current Standby operation |
| LIMP (Pin 17) | Limp-home safety output | Active-low open-drain output asserted during overtemperature or critical fault; controlled via LHC bit in Mode_Control register |
| SPLIT (Pin 24) | CAN common-mode stabilizer | Connects to external 4.7 nF capacitor to stabilize recessive bus level; improves signal integrity on long CAN stubs |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-network interface | Single-chip replacement for discrete CAN + dual-LIN transceivers, eliminating board space and BOM count while ensuring interoperability with TJA1042 and legacy LIN nodes |
| Automotive-grade power management | V1 operates down to 4.5 V (cranking), V2 down to 5.5 V; both include undervoltage warning/reset with configurable thresholds and hysteresis |
| Intelligent wake-up architecture | Three independent wake sources (CAN bus activity, LIN bus activity, local WAKE pins) with source identification and configurable interrupt masking per channel |
| Fail-safe system control | Overtemperature shutdown with automatic limp-home activation (LIMP = LOW), bidirectional RSTN, and global EN output for external safety hardware enable/disable |
| Robust physical layer protection | ±58 V short-circuit tolerance on CAN/LIN pins; ±8 kV HBM / ±6 kV IEC 61000-4-2 ESD rating; ISO 7637-3 transient immunity on BAT/CAN/LIN lines |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Centralized power and communication hub in gasoline/diesel engine management systems, coordinating crankshaft/camshaft sensors, fuel injectors, and throttle actuators via CAN and LIN subnets. IC Role / Device Role / Timing Role: Core SBC providing controlled MCU startup, CAN backbone connectivity, dual-LIN sensor/actuator sub-bus control, and limp-home fail-safe response during overtemperature events. Use Value: Eliminates discrete regulators, transceivers, and watchdog ICs; reduces component count by ≥7 parts; ensures cranking-voltage operation (VBAT ≥4.5 V) and meets ISO 16750-2 cold-cranking requirements. | Use Scenario: Power and networking interface for vehicle body electronics including door modules, lighting controls, and seat position memory, where LIN networks manage low-cost sensors and actuators. IC Role / Device Role / Timing Role: Dual-LIN transceiver hub with 3.3 V MCU supply and local wake-up capability; enables low-power Standby mode with selective LIN bus wake detection and bias-controlled WAKE inputs. Use Value: Supports 10.4 kbit/s low-slope LIN for EMC-critical cabin environments; extends battery life via <10 µA Sleep mode current; integrates DLIN termination diode to reduce external components. |
| Advanced Driver Assistance Systems (ADAS) | Electric Power Steering (EPS) |
Use Scenario: Safety-critical domain controller interfacing radar, camera, and ultrasonic sensors via CAN, while using LIN for auxiliary functions like mirror adjustment or washer fluid level sensing. IC Role / Device Role / Timing Role: High-integrity SBC delivering deterministic reset behavior, SPI-accessible diagnostic status, and overtemperature-triggered limp-home output to initiate safe degradation protocols. Use Value: Meets ASIL-B functional safety requirements through independent watchdog (window mode), redundant voltage monitoring (V1/V2), and fail-safe LIMP assertion without MCU intervention. | Use Scenario: ECU in electric power steering systems requiring precise torque control, motor driver coordination, and fail-operational behavior during electrical faults. IC Role / Device Role / Timing Role: System basis chip supplying 3.3 V to EPS MCU, powering internal CAN transceiver, and enabling cyclic wake-up for periodic motor position checks during low-power states. Use Value: Enables ISO 26262-compliant safe state entry via LIMP output; supports remote flash programming over CAN; maintains CAN communication integrity during load dump (ISO 7637 pulse 5a). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive SBC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TJA1043TK/3V3/WD,1 | Single-CAN, no LIN interfaces; 3.3 V V1 regulator; lacks dual-LIN and LIMP output; smaller HVQFN24 package | Suitable only for CAN-only ECUs without LIN peripheral control; cannot replace dual-LIN topology | Select when LIN functionality is unnecessary and board space is constrained; requires separate LIN transceivers if LIN needed |
| UJA1169ATW/3V3/WD,1 | Newer generation SBC with identical 3.3 V V1, dual-LIN, and watchdog; adds CAN FD support, improved ESD (±10 kV), and enhanced sleep current (<5 µA) | Backward-compatible pinout but requires firmware update for CAN FD and new register map; supports next-gen ADAS with higher bandwidth | Choose for new designs requiring CAN FD or lower power; not drop-in for legacy UJA1078 layouts due to revised SPI timing and fault reporting |
Compared with TJA1043TK/3V3/WD,1 and UJA1169ATW/3V3/WD,1, the UJA1078TW/3V3/WD,1 uniquely balances mature dual-LIN integration, limp-home safety output, and proven cranking-voltage operation - making it optimal for cost-sensitive, high-volume body and powertrain ECUs where CAN FD is not required and legacy compatibility is critical.
Availability
UJA1078TW/3V3/WD,1 is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS domain controllers requiring stable component supply, automotive qualification (AEC-Q100 Grade 1), and long-term lifecycle support.
Supply support for UJA1078TW/3V3/WD,1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive-grade analog and mixed-signal ICs.
The UJA1078TW/3V3/WD,1 belongs to NXP's System Basis Chip product line, designed specifically to consolidate power regulation, high-speed CAN, dual-LIN, and safety monitoring into a single automotive-qualified IC for ECU simplification and reliability enhancement.
FAQ
What is the nominal output voltage and accuracy of the V1 regulator in the UJA1078TW/3V3/WD,1?
The UJA1078TW/3V3/WD,1 features a 3.3 V V1 regulator with ±2 % accuracy for LIN master applications and ±3 % for LIN slave applications. This precision ensures reliable MCU operation across temperature and load variations while meeting automotive sensor interface requirements. The regulator delivers up to 250 mA and supports external PNP extension for higher current demands.
Does the UJA1078TW/3V3/WD,1 support CAN FD or only classical CAN?
The UJA1078TW/3V3/WD,1 supports only classical high-speed CAN (ISO 11898-2/5) and does not implement CAN FD. Its CAN transceiver is interoperable with TJA1042 and optimized for 1 Mbit/s operation with SPLIT pin stabilization. For CAN FD, consider the newer UJA1169ATW/3V3/WD,1, which offers backward-compatible functionality with added FD capability.
How does the watchdog function in the UJA1078TW/3V3/WD,1, and what are its operating modes?
The UJA1078TW/3V3/WD,1 includes an advanced watchdog with Window and Timeout modes, clocked by an on-chip oscillator independent of V1/V2. The watchdog period is programmable from 8 ms to 4096 ms via the NWP bits in the WD_and_Status register. It resets the SBC on overflow (Timeout) or early trigger (Window mode first half), and can be disabled via the WDOFF pin - triggering a software-initiated reset.
What is the purpose of the LIMP output pin on the UJA1078TW/3V3/WD,1, and how is it activated?
The LIMP pin (Pin 17) on the UJA1078TW/3V3/WD,1 is an active-low open-drain safety output that asserts LOW during overtemperature events or critical system faults. It is controlled by the LHC bit in the Mode_Control register and automatically activated when chip temperature exceeds Tth(act)otp, enabling connection to external 'limp home' hardware such as reduced-power actuator drivers or dashboard warning indicators.
Can the UJA1078TW/3V3/WD,1 operate during automotive cranking conditions, and what are its minimum supply requirements?
Yes, the UJA1078TW/3V3/WD,1 is designed for automotive cranking: V1 regulator operates down to 4.5 V VBAT (per ISO 16750-2 and ISO 7637 pulse 4b), and V2 regulator operates down to 5.5 V. This ensures continuous CAN/LIN communication and MCU supply stability during engine start, even when battery voltage dips below 6 V - a key requirement for powertrain and chassis ECUs.
UJA1078TW/3V3/WD,1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- -
- Interface:
- CAN, LIN
- Voltage - Supply:
- 4.5V ~ 28V
- Supplier Device Package:
- 32-HTSSOP
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
UJA1078TW/3V3/WD,1 FAQ
1.How can I place an order for UJA1078TW/3V3/WD,1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UJA1078TW/3V3/WD,1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UJA1078TW/3V3/WD,1 reliable?
The price and inventory of UJA1078TW/3V3/WD,1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UJA1078TW/3V3/WD,1 is usually 5 days.
3.What payment methods are accepted for UJA1078TW/3V3/WD,1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UJA1078TW/3V3/WD,1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UJA1078TW/3V3/WD,1?
UJA1078TW/3V3/WD,1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UJA1078TW/3V3/WD,1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UJA1078TW/3V3/WD,1?
For technical support, including UJA1078TW/3V3/WD,1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UJA1078TW/3V3/WD,1 requirements.
6.How does Aetrix verify that UJA1078TW/3V3/WD,1 is sourced from the original manufacturer or authorized distributors?
All UJA1078TW/3V3/WD,1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UJA1078TW/3V3/WD,1 meets industry standards.
7.What is the process for return or replacement of UJA1078TW/3V3/WD,1?
All UJA1078TW/3V3/WD,1 units undergo pre-shipment inspection (PSI). If there is an issue with UJA1078TW/3V3/WD,1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UJA1078TW/3V3/WD,1 part is unused and in its original packaging.
Return procedure for UJA1078TW/3V3/WD,1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UJA1078TW/3V3/WD,1 Tags
-
NVT4857UKAZ
NXP Semiconductors
-
TCA8418RTWR
Texas Instruments
-
PCA9546APWR
Texas Instruments
-
MD0100N8-G
Microchip Technology
-
PCA9548APW,118
NXP Semiconductors
-
PCA9540BDP,118
NXP Semiconductors
-
PCA9548APWR
Texas Instruments
-
PCA9546APW,118
NXP Semiconductors
-
PTN3360DBS,518
NXP Semiconductors
-
PCA9546ABS,118
NXP Semiconductors
-
PCA9518PWR
Texas Instruments
-
PCA9545APW,118
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
